Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment. The battery device comprises a battery monomer, a confluence component, a separator and a heat shrink tube. The battery monomer comprises a shell, an electrode assembly, an electrode terminal and an insulating part, the electrode assembly is arranged in the shell, the shell comprises a wall part, the electrode terminal is arranged on the wall part, the insulating part is connected to the wall part, the insulating part at least partially surrounds the electrode terminal and is fixed with the electrode terminal, and the electrode terminal is connected to the electrode assembly; the insulator exceeds the wall portion in a direction away from the electrode assembly. At least part of the confluence component is located on the side, away from the electrode assembly, of the electrode terminal and connected to the electrode terminal. The separator is disposed on a side of the wall portion facing away from the electrode assembly. The heat shrink tube is connected to the isolation piece, at least part of the heat shrink tube is located between the confluence component and the wall part, and the heat shrink tube surrounds the insulation piece. The heat shrink tube can block welding particles, the possibility that the welding particles fall between the separator and the wall part is reduced, the risk of short circuit is reduced, and the reliability of the battery device is improved.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a battery device and an electrical device. Background Art

[0002] With the development of new energy technologies, batteries are more widely used. For example, batteries are not only applied to energy storage power systems such as hydroelectric, thermal, wind, and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in multiple fields such as military equipment and aerospace.

[0003] The development of battery technology needs to consider multiple design factors simultaneously. For example, performance parameters such as energy density, cycle life, discharge capacity, charge-discharge rate, etc. In addition, the reliability of the battery also needs to be considered. Utility Model Content

[0004] The embodiments of this application provide a battery device and an electrical device, which can improve reliability.

[0005] According to the first aspect of this application, this application provides a battery device. The battery device includes battery cells, a busbar component, a separator, and a heat shrink tube. Each battery cell includes a housing, an electrode assembly, an electrode terminal, and an insulating member. The electrode assembly is disposed inside the housing. The housing includes a wall portion. The electrode terminal is disposed on the wall portion. The insulating member is connected to the wall portion. The insulating member at least partially surrounds the electrode terminal and is fixed to the electrode terminal. The electrode terminal is connected to the electrode assembly. The insulating member extends beyond the wall portion in a direction away from the electrode assembly. At least a part of the busbar component is located on a side of the electrode terminal away from the electrode assembly and is connected to the electrode terminal. The separator is disposed on a side of the wall portion away from the electrode assembly. The heat shrink tube is connected to the separator. At least a part of the heat shrink tube is located between the busbar component and the wall portion. The heat shrink tube surrounds the insulating member. The heat shrink tube can, to a certain extent, block or isolate the welding particles generated when the busbar component and the electrode terminal are connected, reducing the possibility of the welding particles falling between the separator and the wall portion, which is beneficial to reducing the short-circuit risk and improving the reliability of the battery device. Along the thickness direction of the wall portion, the overall formed by the separator and the heat shrink tube can cover at least a part of the wall portion, thus replacing the traditional insulating patch, which is beneficial to simplifying the structure and assembly process of the battery device.

[0006] When the heat shrink tube and the battery cell are assembled, a relatively large gap is allowed between the heat shrink tube and the insulating member to reduce the interference between the heat shrink tube and the insulating member, which is beneficial to improving the assembly efficiency. After assembly, the heat shrink tube is heated to make it shrink and deform to reduce the assembly gap between the heat shrink tube and the insulating member, achieving the effect of preventing the welding particles from falling onto the wall portion.

[0007] In some embodiments, the insulating member includes an outer peripheral surface that faces away from the electrode terminal in a direction perpendicular to the thickness direction of the wall portion; at least a portion of the heat-shrinkable tube is attached to the outer peripheral surface. There is no gap between the heat-shrinkable tube and the insulating member, which can prevent welding particles from falling onto the wall portion through the interface between the heat-shrinkable tube and the insulating member, facilitating improvement of the effect of preventing particle dropping.

[0008] In some embodiments, the insulating member includes a first surface that faces away from the electrode assembly in the thickness direction of the wall portion; the heat-shrinkable tube extends beyond the insulating member in a direction away from the wall portion, and at least a portion of the heat-shrinkable tube is attached to the first surface. In the thickness direction of the wall portion, the heat-shrinkable tube can cover at least a portion of the insulating member, reducing the occurrence of welding particles aggregating between the heat-shrinkable tube and the outer peripheral surface, further reducing the possibility of welding particles falling onto the wall portion, and facilitating further reduction of the short-circuit risk.

[0009] In some embodiments, in the thickness direction of the wall portion, the projection of the heat-shrinkable tube and the projection of the spacer partially overlap. Thereby, it is beneficial to improve the connection strength and stability between the heat-shrinkable tube and the spacer, and also reduces the possibility of welding particles falling onto the wall portion through the interface between the heat-shrinkable tube and the spacer, facilitating further reduction of the short-circuit risk.

[0010] In some embodiments, the heat-shrinkable tube includes a first portion and a second portion formed integrally. The first portion is located on the side of the spacer facing the wall portion and is connected to the spacer. In a direction perpendicular to the thickness direction of the wall portion, the second portion is located on the side of the spacer facing the insulating member, and the second portion at least partially surrounds the insulating member. By connecting the first portion to the spacer, it is beneficial to increase the connection area between the heat-shrinkable tube and the spacer, improving the connection strength and stability; by surrounding at least a portion of the insulating member with the second portion, it is beneficial to increase the area of the heat-shrinkable tube surrounding the insulating member, improving the effect of preventing particle dropping.

[0011] In some embodiments, the second portion extends beyond the spacer in a direction away from the wall portion, which is beneficial to further increase the mating area between the second portion and the insulating member, further improving the effect of preventing particle dropping.

[0012] In some embodiments, the heat-shrinkable tube is bonded to the spacer; or, the heat-shrinkable tube and the spacer are integrally injection-molded together. The heat-shrinkable tube and the spacer can be pre-assembled into a whole and then assembled with the battery cell, which is beneficial to reducing the assembly tolerance with the battery cell, simplifying the assembly operation, and improving the assembly efficiency.

[0013] In some embodiments, the hardness of the spacer is greater than the hardness of the heat-shrinkable tube. The spacer has a relatively large hardness and is not easily deformed, which can play a certain supporting role for the heat-shrinkable tube and stably perform the isolation function. The heat-shrinkable tube has a relatively small hardness, facilitating deformation and shaping.

[0014] In some embodiments, along the direction perpendicular to the thickness direction of the wall portion, the heat-shrinkable tube is spaced apart from the electrode terminal. The heat-shrinkable tube does not cover the surface of the electrode terminal and affect the connection between the electrode terminal and the bus bar component. Moreover, the heat transferred to the electrode terminal when the heat-shrinkable tube is heated can also be reduced, which is beneficial to reducing the influence of the heat-shrinkable tube on the performance of the electrode terminal.

[0015] In some embodiments, along the thickness direction of the wall portion, the heat-shrinkable tube is spaced apart from the bus bar component. The heat-shrinkable tube does not contact the bus bar component, and no mutual force is generated therebetween, which will not affect the welding of the bus bar component and the electrode terminal, and is beneficial to improving the welding effect of the bus bar component and the electrode terminal.

[0016] In some embodiments, the housing includes a housing body and an end cap. The housing body has an opening, and the end cap covers the opening; the wall portion is the end cap.

[0017] According to the second aspect of the present application, an electrical device is further provided in an embodiment of the present application, which includes a battery device provided in any embodiment of the present application, and the battery device is used to provide electrical energy. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0020] Figure 2 It is an exploded structural diagram of a battery device provided in some embodiments of the present application.

[0021] Figure 3 It is an exploded structural diagram of a battery cell of a battery device provided in some embodiments of the present application.

[0022] Figure 4 It is a partial cross-sectional structural diagram of a battery device provided in some embodiments of the present application.

[0023] Figure 5 is Figure 4 an enlarged structural diagram of region A in

[0024] Figure 6 It is a schematic structural diagram during the assembly process of a separator, a heat-shrinkable tube and a battery cell of a battery device provided in some embodiments of the present application.

[0025] Figure 7 is Figure 6Schematic diagram of the enlarged structure of the middle region B.

[0026] Figure 8 is Figure 6 Schematic diagram of the partial sectional structure of...

[0027] In the accompanying drawings:

[0028] Vehicle 1000, battery device 100, controller 200, motor 300;

[0029] Battery cell 10, housing 11, wall portion 111, housing body 11a, opening 11a1, end cap 11b, electrode assembly 12, electrode terminal 13, insulating member 14, outer peripheral surface 141, first surface 142, box body 20, first box body portion 21, second box body portion 22, bus bar member 30, separator 40, heat shrinkable tube 50, first portion 51, second portion 52, flexible circuit board 60, thickness direction X. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the description of the present application in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the description and claims of the present application and the above accompanying drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of the present application or the above accompanying drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0032] Referring to "embodiments" in the present application means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0033] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "joined", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0034] The term "and / or" in the present application is merely an associative relationship describing associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after.

[0035] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed descriptions of the same components are omitted. It should be understood that the thickness, length, width, etc. of various components shown in the drawings in the embodiments of the present application, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to the present application.

[0036] The term "a plurality of" appearing in the present application refers to two or more (including two).

[0037] In the embodiments of the present application, "parallel" includes not only the case of absolute parallelism but also the case of approximately parallelism as conventionally recognized in engineering; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity but also the case of approximately perpendicularity as conventionally recognized in engineering.

[0038] In the embodiments of the present application, the battery cell can be a secondary battery cell, and a secondary battery cell refers to a battery cell that can be activated by charging after discharging to continue use.

[0039] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium-metal battery cell, a sodium-metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of the present application are not limited thereto.

[0040] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc., and the present application has no special limitation.

[0041] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0042] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0043] The battery device generally includes a box body for encapsulating one or more battery cells. The box body can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0044] As an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties. The battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0045] As an example, the box body may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0046] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, a part of the box body can become at least a part of the vehicle floor, or a part of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0047] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0048] The battery device generally uses a busbar component to connect each battery cell, and a separator is used to partially separate the busbar component and the battery cell. The separator can also play a role in supporting the busbar component. The separator can be, for example, a separator plate. The electrode terminal of the battery cell is connected to the busbar component by welding, and an insulating member is fixedly provided around the electrode terminal to insulate and isolate the electrode terminal from the outer shell of the battery cell through the insulating member. To ensure a certain assembly tolerance, the aperture of the avoidance hole corresponding to the electrode terminal on the separator is much larger than the outer diameter of the insulating member, resulting in a certain gap between the separator and the insulating member. However, the welding particles generated during the welding of the electrode terminal and the busbar component may fall between the outer shell of the battery cell and the separator through the gap between the separator and the insulating member, thus causing an internal short circuit phenomenon.

[0049] In view of this, the embodiments of the present application provide a technical solution. By providing a heat-shrinkable tube connected to the separator, at least a part of the heat-shrinkable tube is located between the busbar component and the outer wall of the battery cell. After the heat-shrinkable tube is deformed by heat, at least a part of it surrounds the insulating member. The heat-shrinkable tube can, to a certain extent, block or isolate the welding particles generated when the busbar component and the electrode terminal are connected, reducing the possibility of the welding particles falling between the separator and the wall, which is beneficial to reducing the short-circuit risk and improving the reliability of the battery device.

[0050] The technical solution provided by the embodiments of the present application can be used in battery devices and electrical equipment that uses the battery device as a power source.

[0051] The electrical equipment can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0052] For the convenience of description, the following embodiments take the electrical equipment as a vehicle as an example for illustration.

[0053] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application. Referring to Figure 1 , the vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The vehicle 1000 is internally provided with a battery device 100, and the battery device 100 can be arranged at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for the power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0054] In some embodiments of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0055] Figure 2 is a schematic exploded structural diagram of a battery device provided by some embodiments of the present application. Referring to Figure 2 , the battery device 100 can include a box body 20 and a plurality of battery cells 10, and the plurality of battery cells 10 are accommodated in the box body 20.

[0056] The housing 20 can be a component for accommodating the battery cells 10. The housing 20 provides an accommodation space for the battery cells 10, and the housing 20 can adopt various structures.

[0057] In some embodiments, the housing 20 can include a first housing portion 21 and a second housing portion 22. The first housing portion 21 and the second housing portion 22 cover each other, and the first housing portion 21 and the second housing portion 22 jointly define an accommodation space for accommodating the battery cells 10. The second housing portion 22 can be a hollow structure with one end open, and the first housing portion 21 is a plate-like structure. The first housing portion 21 covers the open side of the second housing portion 22 to form the housing 20 with an accommodation space; both the first housing portion 21 and the second housing portion 22 can also be hollow structures with one side open, and the open side of the first housing portion 21 covers the open side of the second housing portion 22 to form the housing 20 with an accommodation space. Of course, the first housing portion 21 and the second housing portion 22 can be in various shapes, such as a cylinder, a cuboid, etc.

[0058] To improve the sealing performance after the connection between the first housing portion 21 and the second housing portion 22, a sealing member can also be provided between the first housing portion 21 and the second housing portion 22, such as sealant, sealing ring, etc.

[0059] Assuming that the first housing portion 21 covers the top of the second housing portion 22, the first housing portion 21 can also be called the upper cover, and the second housing portion 22 can also be called the lower housing.

[0060] In the battery device 100, there can be one or more battery cells 10. If there are multiple battery cells 10, the multiple battery cells 10 can be connected in series, in parallel, or in a combination of series and parallel. A combination of series and parallel means that there are both series and parallel connections among the multiple battery cells 10.

[0061] The multiple battery cells 10 can be directly connected in series, in parallel, or in a combination of series and parallel together, and then the whole formed by the multiple battery cells 10 is accommodated in the housing 20; of course, it can also be that multiple battery cells 10 are first connected in series, in parallel, or in a combination of series and parallel to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a combination of series and parallel to form a whole and are accommodated in the housing 20.

[0062] Exemplarily, the battery cell 10 can be the smallest unit that makes up the battery.

[0063] Figure 3 is an exploded structural schematic diagram of the battery cell of the battery device provided in some embodiments of the present application, Figure 4 is a partial cross-sectional structural schematic diagram of the battery device provided in some embodiments of the present application, Figure 5 is Figure 4 an enlarged structural schematic diagram of region A in Figures 2 to 5, the battery device 100 provided by the embodiment of the present application includes battery cells 10, a current collecting component 30, a separator 40, and a heat shrinkable tube 50. The battery cell 10 includes a housing 11, an electrode assembly 12, an electrode terminal 13, and an insulating member 14. The electrode assembly 12 is disposed inside the housing 11. The housing 11 includes a wall portion 111. The electrode terminal 13 is disposed on the wall portion 111. The insulating member 14 is connected to the wall portion 111. The insulating member 14 at least partially surrounds the electrode terminal 13 and is fixed to the electrode terminal 13. The electrode terminal 13 is connected to the electrode assembly 12. The insulating member 14 extends beyond the wall portion 111 in a direction away from the electrode assembly 12. At least a part of the current collecting component 30 is located on a side of the electrode terminal 13 away from the electrode assembly 12 and is connected to the electrode terminal 13. The separator 40 is disposed on a side of the wall portion 111 away from the electrode assembly 12. The heat shrinkable tube 50 is connected to the separator 40. At least a part of the heat shrinkable tube 50 is located between the current collecting component 30 and the wall portion 111. The heat shrinkable tube 50 surrounds the insulating member 14.

[0064] The electrode assembly 12 is a component in the battery cell 10 where an electrochemical reaction occurs.

[0065] The number of the electrode assemblies 12 can be one or multiple.

[0066] The housing 11 has a hollow structure, and an accommodation space for accommodating the electrode assembly 12 and the electrolyte is formed inside it. The shape of the housing 11 can be cylindrical, prismatic, cuboid, or other shapes.

[0067] Optionally, the housing 11 may include a housing body 11a and an end cap 11b, and the housing body 11a and the end cap 11b can be independent components. The housing body 11a has an opening, and the end cap 11b covers the opening of the housing body 11a.

[0068] The housing body 11a can be open at one end or both ends. Exemplarily, the housing body 11a has a structure with an opening on one side, and the end cap 11b is provided as one and covers the opening of the housing body 11a. As another example, the housing body 11a can also have a structure with openings on both sides, and the end caps 11b are provided as two, and the two end caps 11b respectively cover the two openings of the housing body 11a.

[0069] The housing body 11a may include a plurality of integrally formed shell walls, and the end cap 11b and the plurality of shell walls of the housing body 11a jointly enclose the internal space of the housing 11.

[0070] The housing 11a can be made of a variety of materials, such as copper, iron, aluminum, and aluminum alloys. The material of the end cap 11b can be the same as or different from that of the housing 11a. Optionally, the end cap 11b can be made of a material with a certain hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.). This makes the end cap 11b less likely to deform when subjected to compression or collision, thereby providing the battery cell 10 with greater structural strength and improved reliability.

[0071] The wall portion 111 may be an end cover 11 b or one of the walls of the housing 11 a .

[0072] The electrode terminal 13 is electrically connected to the electrode assembly 12 and is used to draw current from the electrode assembly 12. The electrode terminal 13 can be directly connected to the electrode assembly 12 or indirectly connected to the electrode assembly 12 via a switching component.

[0073] The electrode terminal 13 extends beyond the wall portion 111 in a direction away from the electrode assembly 12 . At least a portion of the electrode terminal 13 is located on a side of the wall portion 111 away from the electrode assembly 12 .

[0074] The insulating member 14 may surround at least a portion of the electrode terminal 13 and be fixed to the electrode terminal 13. The insulating member is used to insulate and isolate the electrode terminal 13 from the wall portion 111. Optionally, the insulating member 14 may be made of plastic.

[0075] The insulating member 14 can extend beyond the wall portion 111 in a direction away from the electrode assembly 12 to improve its insulation isolation. The electrode terminal 13 extends beyond the wall portion 111 in a direction away from the electrode assembly 12. The length of the insulating member 14 extending beyond the wall portion 111 is smaller than the length of the electrode terminal 13 extending beyond the wall portion 111. After the electrode terminal 13 is connected to the busbar 30, the insulating member 14 and the busbar 30 can be spaced apart without affecting the connection between the busbar 30 and the electrode terminal 13.

[0076] Optionally, the wall portion 111 may be provided with a through hole, and a portion of the electrode terminal 13 is located in the through hole, so that the electrode terminal 13 is connected to the electrode assembly 12 located inside the housing 11 through the through hole.

[0077] Alternatively, the electrode terminal 13 may penetrate the wall portion 111 along the thickness direction X of the wall portion 111 so as to connect the electrode assembly 12 inside the housing 11 and the busbar 30 outside the housing 11 .

[0078] The busbar component 30 can be connected to the electrode terminal 13 by laser welding or other suitable welding methods. The busbar component 30 is used to connect the electrode terminal 13 to the management system of the battery device 100.

[0079] The current collecting component 30 can be entirely located on the side of the electrode terminal 13 away from the electrode assembly 12, or can be partially located on the side of the electrode terminal 13 away from the electrode assembly 12.

[0080] The separator 40 can be entirely disposed on the side of the wall portion 111 facing away from the electrode assembly 12. The current collecting component 30 is located on the side of the separator 40 facing away from the wall portion 111. The separator 40 is at least used to isolate the wall portion 111 and the current collecting component 30.

[0081] Optionally, the battery device 100 further includes a flexible circuit board 60. The flexible circuit board 60 is disposed on the side of the separator 40 facing away from the wall portion 111 and is connected to the current collecting component 30. The separator 40 is also used to isolate the flexible circuit board 60 and the wall portion 111.

[0082] Optionally, the separator 40 can be in a plate-like structure to increase its isolation area.

[0083] The separator 40 can be connected to the current collecting component 30 by riveting, screw connection, bonding, snap connection or other suitable means. The separator 40 can also be connected to the box body 20 or the support structure in the box body 20 by riveting, screw connection, bonding, snap connection or other suitable means to support the separator 40 through the box body 20 or the support structure.

[0084] The material of the separator 40 can include insulating materials.

[0085] The separator 40 can surround the insulating member 14 and be spaced apart from the insulating member 14. At least a part of the heat shrinkable tube 50 is located between the separator 40 and the insulating member 14.

[0086] The heat shrinkable tube 50 can be connected to the separator 40 by bonding, abutting, injection molding or other suitable means.

[0087] Along the thickness direction X of the wall portion 111, the heat shrinkable tube 50 can be entirely located between the current collecting component 30 and the wall portion 111, or can be partially located between the current collecting component 30 and the wall portion 111.

[0088] The heat shrinkable tube 50 can surround the insulating member 14. The heat shrinkable tube 50 can be in contact with the insulating member 14 or not.

[0089] The shape of the insulating member 14 and the shape of the heat shrinkable tube 50 can both match the shape of the part of the electrode terminal 13 exposed from the wall portion 111. The part of the electrode terminal 13 exposed from the wall portion 111 is located on the side of the wall portion 111 facing away from the electrode assembly 12. For example, the part of the electrode terminal 13 exposed from the wall portion 111 can be rectangular, and the shape of the insulating member 14 and the shape of the heat shrinkable tube 50 can both be rectangular. Another example is that the part of the electrode terminal 13 exposed from the wall portion 111 can be cylindrical, and the shape of the insulating member 14 and the shape of the heat shrinkable tube 50 can both be cylindrical.

[0090] In one example, the surface of the heat-shrinkable tube 50 facing away from the wall portion 111 may be flush with the surface of the insulating member 14 facing away from the electrode assembly 12, or the heat-shrinkable tube 50 may extend beyond the insulating member 14 in the direction away from the wall portion 111. The heat-shrinkable tube 50 surrounds the section of the insulating member 14 that exposes the wall portion 111.

[0091] In another example, the insulating member 14 may extend beyond the heat-shrinkable tube 50 in the direction away from the wall portion 111. The heat-shrinkable tube 50 surrounds a part of the section of the insulating member 14 that exposes the wall portion 111.

[0092] The heat-shrinkable tube 50 can undergo shrinkage deformation when heated.

[0093] The shape of the heat-shrinkable tube 50 matches the shape of the insulating member 14, as long as it can surround the insulating member 14.

[0094] Optionally, the material of the heat-shrinkable tube 50 may include polyvinyl chloride, polyethylene terephthalate, or other suitable insulating heat-shrinkable materials.

[0095] The heat-shrinkable tube 50 can be heated in various ways, such as by electric heating, hot air blowing, heat radiation, etc.

[0096] In the embodiments of the present application, at least a part of the heat-shrinkable tube 50 is disposed between the bus bar component 30 and the wall portion 111, and the insulating member 14 is surrounded by the heat-shrinkable tube 50. The heat-shrinkable tube 50 can, to a certain extent, block or isolate the welding particles generated when the bus bar component 30 and the electrode terminal 13 are connected, reducing the possibility of the welding particles falling between the spacer 40 and the wall portion 111, which is beneficial to reducing the short-circuit risk and improving the reliability of the battery device 100.

[0097] It can be understood that during assembly, the integral formed by the spacer 40 and the heat-shrinkable tube 50 can be first assembled with the battery cell 10, and then the bus bar component 30 and the electrode terminal 13 are connected. In this way, the bus bar component 30 does not block the heat-shrinkable tube 50, facilitating the heat-shrinkable tube 50 to directly receive heat and improving the assembly efficiency. Moreover, the bus bar component 30 and the electrode terminal 13 can be connected after the heat-shrinkable tube 50 undergoes heat-shrinkage deformation, which can more effectively achieve the effect of preventing particle dropping.

[0098] The spacer 40 is disposed on the side of the wall portion 111 facing away from the electrode assembly 12, and the spacer 40 is connected to the heat-shrinkable tube 50. Along the thickness direction X, the integral formed by the spacer 40 and the heat-shrinkable tube 50 can cover at least a part of the wall portion 111, thereby replacing the traditional insulating patch, which is beneficial to simplifying the structure and assembly process of the battery device 100.

[0099] Figure 6 It is a schematic structural diagram during the assembly process of the spacer, heat-shrinkable tube, and battery cell of the battery device provided by some embodiments of the present application. Figure 7Yes Figure 6 Schematic enlarged structure diagram of the middle region B Figure 8 Yes Figure 6 Partial sectional structure diagram of Figures 6 to 8 In Figures 6 to 8 , the heat shrinkable tube 50 has not been deformed by heat yet.

[0100] Refer to Figure 6 and Figure 8 Due to the special material of the heat shrinkable tube 50, when the heat shrinkable tube 50 is assembled with the battery cell 10, a relatively large gap is allowed to exist between the heat shrinkable tube 50 and the insulating member 14 to reduce the interference between the heat shrinkable tube 50 and the insulating member 14, which is beneficial to improving the assembly efficiency. After assembly, the heat shrinkable tube 50 is heated to make it shrink and deform to reduce the assembly gap between the heat shrinkable tube 50 and the insulating member 14, so as to achieve the effect of preventing welding particles from falling onto the wall portion 111.

[0101] In some embodiments, referring to Figure 5 , the insulating member 14 includes an outer peripheral surface 141, and the outer peripheral surface 141 faces away from the electrode terminal 13 in the direction perpendicular to the thickness direction X of the wall portion 111. At least a part of the heat shrinkable tube 50 is attached to the outer peripheral surface 141.

[0102] The outer peripheral surface 141 is the outer side surface of the insulating member 14 facing the separator 40.

[0103] The insulating member 14 may further include an inner peripheral surface, and the inner peripheral surface faces the electrode terminal 13 in the direction perpendicular to the thickness direction X of the wall portion 111. The inner peripheral surface may be attached to the electrode terminal 13.

[0104] The heat shrinkable tube 50 may be integrally attached to the outer peripheral surface 141, or may be partially attached to the outer peripheral surface 141, and another part of the heat shrinkable tube 50 may be attached to other surfaces of the insulating member 14 or be located between the wall portion 111 and the separator 40.

[0105] In the embodiment of the present application, at least a part of the heat shrinkable tube 50 is attached to the outer peripheral surface 141, and there is no gap between the heat shrinkable tube 50 and the insulating member 14, which can prevent welding particles from falling onto the wall portion 111 through the interface between the heat shrinkable tube 50 and the insulating member 14, and is beneficial to improving the effect of preventing particle dropping.

[0106] In some embodiments, referring to Figure 5 , the insulating member 14 includes a first surface 142, and the first surface 142 faces away from the electrode assembly 12 in the thickness direction X of the wall portion 111. The heat shrinkable tube 50 extends beyond the insulating member 14 in the direction away from the wall portion 111, and at least a part of the heat shrinkable tube 50 is attached to the first surface 142.

[0107] After being heated, the heat-shrinkable tube 50 shrinks and deforms in the direction towards the electrode terminal 13. A part of the heat-shrinkable tube 50 can be attached to the outer peripheral surface 141 of the insulating member 14, and the part of the heat-shrinkable tube 50 that extends beyond the insulating member 14 can continue to shrink in the direction towards the electrode terminal 13 and be attached to the first surface 142.

[0108] In the embodiment of the present application, at least a part of the heat-shrinkable tube 50 is attached to the first surface 142. Along the thickness direction X, the heat-shrinkable tube 50 can cover at least a part of the insulating member 14, reducing the occurrence of welding particles accumulating between the heat-shrinkable tube 50 and the outer peripheral surface 141, and further reducing the possibility of welding particles falling onto the wall portion 111, which is beneficial to further reducing the short-circuit risk.

[0109] In some embodiments, referring to Figure 5 , along the thickness direction X of the wall portion 111, the projections of the heat-shrinkable tube 50 and the spacer 40 partially overlap.

[0110] A part of the heat-shrinkable tube 50 can be disposed on the side of the spacer 40 facing away from the wall portion 111, or can also be disposed on the side of the spacer 40 facing the wall portion 111.

[0111] Optionally, the overlapping part of the projection of the heat-shrinkable tube 50 and the projection of the spacer 40 can be annular. That is, along the thickness direction X, the heat-shrinkable tube 50 has an overlapping part with the spacer 40 throughout the circumference around the electrode terminal 13.

[0112] In the thickness direction X, the existence of the overlapping part between the heat-shrinkable tube 50 and the spacer 40 is beneficial to improving the connection strength and stability between the heat-shrinkable tube 50 and the spacer 40, and also reduces the possibility of welding particles falling onto the wall portion 111 through the interface between the heat-shrinkable tube 50 and the spacer 40, which is beneficial to further reducing the short-circuit risk.

[0113] In some embodiments, referring to Figure 5 and Figure 8 , the heat-shrinkable tube 50 includes a first part 51 and a second part 52 formed integrally. The first part 51 is located on the side of the spacer 40 facing the wall portion 111 and is connected to the spacer 40. Along the direction perpendicular to the thickness direction X of the wall portion 111, the second part 52 is located on the side of the spacer 40 facing the insulating member 14, and the second part 52 at least partially surrounds the insulating member 14.

[0114] At least a part of the first part 51 is located between the spacer 40 and the wall portion 111. Exemplarily, the first part 51 and the wall portion 111 can be in contact to support the heat-shrinkable tube 50 and the spacer 40 through the wall portion 111. As another example, the first part 51 and the wall portion 111 can also be not in contact, the heat-shrinkable tube 50 is connected to the spacer 40, and the spacer 40 can be supported by the box body 20 or other structures inside the box body 20.

[0115] The first part 51 can be an annular structure surrounding the second part 52. Optionally, the first part 51 can be an annular gasket.

[0116] At least part of the second part 52 is located between the spacer 40 and the insulator 14. The second part 52 can be attached to the outer peripheral surface 141 of the insulator 14. The side of the spacer 40 facing the insulator 14 may or may not be in contact with the second part 52.

[0117] The second part 52 can be an annular structure surrounding the insulator 14. Optionally, the second part 52 can be tubular.

[0118] In the embodiment of the present application, the heat shrinkable tube 50 is arranged in two parts. Connecting the first part 51 to the spacer 40 is beneficial to increasing the connection area between the heat shrinkable tube 50 and the spacer 40, and improving the connection strength and stability; surrounding at least part of the insulator 14 with the second part 52 is beneficial to increasing the area of the heat shrinkable tube 50 surrounding the insulator 14, and improving the effect of preventing particle dropping.

[0119] In some embodiments, the second part 52 extends beyond the spacer 40 in a direction away from the wall portion 111.

[0120] Optionally, the surface of the second part 52 facing away from the wall portion 111 may be flush with the surface of the insulator 14 facing away from the electrode assembly 12. The second part 52 may also extend beyond the insulator 14 in a direction away from the wall portion 111.

[0121] The second part 52 extending beyond the spacer 40 in a direction away from the wall portion 111 is beneficial to further increasing the mating area between the second part 52 and the insulator 14, and further improving the effect of preventing particle dropping.

[0122] In some embodiments, the heat shrinkable tube 50 is bonded to the spacer 40.

[0123] Optionally, a colloid may be provided between the surface of the first part 51 facing the spacer 40 and the surface of the spacer 40 facing the first part 51, and the first part 51 is bonded to the spacer 40 through the colloid.

[0124] In some other embodiments, the heat shrinkable tube 50 and the spacer 40 are integrally injection-molded together.

[0125] Optionally, the heat shrinkable tube 50 and the spacer 40 can be formed by a two-color injection molding process. When injection molding, the spacer 40 can be injection-molded first, and then the heat shrinkable tube 50 can be injection-molded on the basis of the spacer 40.

[0126] The heat shrinkable tube 50 and the spacer 40 are connected by bonding or injection molding. The heat shrinkable tube 50 and the spacer 40 can be pre-assembled into a whole and then assembled with the battery cell 10, which is beneficial to reducing the assembly tolerance between the heat shrinkable tube 50 and the battery cell 10, simplifying the assembly operation and improving the assembly efficiency.

[0127] In some embodiments, the hardness of the spacer 40 is greater than that of the heat shrinkable tube 50.

[0128] The spacer 40 can be made of a rigid insulating material. The heat shrinkable tube 50 can be made of a soft insulating material.

[0129] The spacer 40 has a relatively large hardness and is not easily deformed, which can play a certain supporting role for the heat shrinkable tube 50 and stably play the isolation role. The heat shrinkable tube 50 has a relatively small hardness, which is convenient for deformation and shaping.

[0130] In some embodiments, referring to Figure 5 , along the direction X perpendicular to the thickness direction of the wall portion 111, the heat shrinkable tube 50 is spaced apart from the electrode terminal 13.

[0131] The heat shrinkable tube 50 is spaced apart from the electrode terminal 13, so that the heat shrinkable tube 50 will not cover the surface of the electrode terminal 13 and affect the connection between the electrode terminal 13 and the bus bar component 30. Moreover, the heat transferred from the heat shrinkable tube 50 to the electrode terminal 13 when the heat shrinkable tube 50 is heated can also be reduced, which is beneficial to reducing the influence of the heat shrinkable tube 50 on the performance of the electrode terminal 13.

[0132] The applicant realizes that during the welding process of the bus bar component 30 and the electrode terminal 13, if there is an interaction force between the heat shrinkable tube 50 and the bus bar component 30, the bus bar component 30 may be lifted, affecting the welding between the bus bar component 30 and the electrode terminal 13, and there may be problems such as false welding or other welding defects between the bus bar component 30 and the electrode terminal 13, affecting the connection reliability.

[0133] Therefore, in some embodiments, along the thickness direction X of the wall portion 111, the heat shrinkable tube 50 is spaced apart from the bus bar component 30.

[0134] The electrode terminal 13 can extend beyond the heat shrinkable tube 50 in the direction away from the electrode assembly 12. After the electrode terminal 13 and the bus bar component 30 are connected, a gap can be formed between the heat shrinkable tube 50 and the bus bar component 30.

[0135] The heat shrinkable tube 50 does not contact the bus bar component 30, and no interaction force will be generated between the two to affect the welding of the bus bar component 30 and the electrode terminal 13, which is beneficial to improving the welding effect of the bus bar component 30 and the electrode terminal 13.

[0136] In some embodiments, referring to Figure 3 and Figure 4, the outer shell 11 includes a housing 11a and an end cap 11b. The housing 11a has an opening 11a1, and the end cap 11b covers the opening 11a1. The wall portion 111 is the end cap 11b.

[0137] Exemplarily, one side of the housing 11a in the thickness direction X has an opening 11a1, and the end cap 11b covers the opening 11a1.

[0138] As another example, both sides of the housing 11a in the thickness direction X have openings 11a1, and the number of end caps 11b is two. The two end caps 11b respectively cover the two openings 11a1, and the wall portion 111 is one of the end caps 11b.

[0139] According to the second aspect of the present application, an electrical device is further provided in an embodiment of the present application. The electrical device includes the battery device 100 provided in any embodiment of the present application, and the battery device 100 is used to provide electrical energy.

[0140] An embodiment of the present application provides a battery device 100, which includes battery cells 10, a current collecting component 30, an isolating member 40, and a heat shrinkable tube 50 made of a heat shrinkable material. The battery cells  10 include an outer shell 11, an electrode assembly 12, electrode terminals 13, and an insulating member 14. The electrode assembly 12 is disposed inside the outer shell 11. The outer shell 11 includes a wall portion 111. The insulating member 14 is connected to the wall portion 111. The insulating member 14 at least partially surrounds the electrode terminals 13 and is fixed to the electrode terminals 13. The electrode terminals 13 are connected to the electrode assembly 12. The insulating member 14 extends beyond the wall portion 111 in a direction away from the electrode assembly 12. At least a part of the current collecting component 30 is located on a side of the electrode terminals 13 away from the electrode assembly 12 and is connected to the electrode terminals 13. The isolating member 40 is disposed on a side of the wall portion 111 away from the electrode assembly 12. The heat shrinkable tube 50 is bonded or integrally injection-molded with the isolating member 40. At least a part of the heat shrinkable tube 50 is located between the current collecting component 30 and the wall portion 111. The heat shrinkable tube 50 at least partially fits on the insulating member 14. The hardness of the isolating member 40 is greater than the hardness of the heat shrinkable tube 50.

[0141] During assembly, the heat shrinkable tube 50 and the insulating member 14 are arranged at intervals to reduce interference during the assembly process and improve the assembly efficiency. After assembly, by heating the heat shrinkable tube 50, the heat shrinkable tube 50 shrinks and deforms to fit on the insulating member 14, which serves to prevent welding particles generated during the welding of the current collecting component 30 and the electrode terminals 13 from falling onto the wall portion 111.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, Comprising: A battery cell, including a housing, an electrode assembly, an electrode terminal, and an insulating member. The electrode assembly is disposed within the housing. The housing includes a wall portion. The insulating member is connected to the wall portion. The insulating member at least partially surrounds the electrode terminal and is fixed to the electrode terminal. The electrode terminal is connected to the electrode assembly. The insulating member extends beyond the wall portion in a direction away from the electrode assembly; A current collecting member, at least a portion of which is located on a side of the electrode terminal away from the electrode assembly and is connected to the electrode terminal; An insulating member, disposed on a side of the wall portion away from the electrode assembly; And A heat shrinkable tube, connected to the insulating member. At least a portion of the heat shrinkable tube is located between the current collecting member and the wall portion. The heat shrinkable tube surrounds the insulating member.

2. The battery device according to claim 1, wherein The insulating member includes an outer peripheral surface that faces away from the electrode terminal in a direction perpendicular to the thickness direction of the wall portion; At least a portion of the heat shrinkable tube is attached to the outer peripheral surface.

3. The battery device according to claim 1, wherein The insulating member includes a first surface that faces away from the electrode assembly in the thickness direction of the wall portion; The heat shrinkable tube extends beyond the insulating member in a direction away from the wall portion. At least a portion of the heat shrinkable tube is attached to the first surface.

4. The battery device according to claim 1, wherein In the thickness direction of the wall portion, the projection of the heat shrinkable tube and the projection of the insulating member partially overlap.

5. The battery device according to claim 4, wherein The heat shrinkable tube includes a first portion and a second portion integrally formed. The first portion is located on a side of the insulating member facing the wall portion and is connected to the insulating member. In a direction perpendicular to the thickness direction of the wall portion, the second portion is located on a side of the insulating member facing the current collecting member. The second portion at least partially surrounds the insulating member.

6. The battery device according to claim 5, wherein The second portion extends beyond the insulating member in a direction away from the wall portion.

7. The battery device according to claim 1, wherein The heat shrinkable tube is bonded to the insulating member; or The heat shrinkable tube is integrally injection-molded and combined with the insulating member.

8. The battery device according to claim 1, wherein The hardness of the insulating member is greater than the hardness of the heat shrinkable tube.

9. The battery device according to claim 1, wherein In a direction perpendicular to the thickness direction of the wall portion, the heat shrinkable tube is spaced apart from the electrode terminal.

10. The battery device according to claim 1, wherein In the thickness direction of the wall portion, the heat shrinkable tube is spaced apart from the current collecting member.

11. The battery device according to claim 1, wherein The housing includes a housing body and an end cap. The housing body has an opening. The end cap covers the opening; the wall portion is the end cap.

12. An electrical device, characterized in that, Including the battery device according to any one of claims 1-11, the battery device is used to provide electrical energy.

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